Biggleswade Castle was a castle

Castle

A castle is a type of fortified structure built in Europe and the Middle East during the Middle Ages by European nobility. Scholars debate the scope of the word castle, but usually consider it to be the private fortified residence of a lord or noble...

 in the market town of Biggleswade

Biggleswade

Biggleswade is a market town and civil parish located on the River Ivel in Bedfordshire, England. It is well served by transport routes, being close to the A1 road between London and the North, as well as having a railway station on the main rail link North from London .-Geography:Located about 40...

 in Bedfordshire

Bedfordshire

Bedfordshire is a ceremonial county of historic origin in England that forms part of the East of England region.It borders Cambridgeshire to the north-east, Northamptonshire to the north, Buckinghamshire to the west and Hertfordshire to the south-east....

.

The existence of this castle was discovered by aerial photography

Aerial photography

Aerial photography is the taking of photographs of the ground from an elevated position. The term usually refers to images in which the camera is not supported by a ground-based structure. Cameras may be hand held or mounted, and photographs may be taken by a photographer, triggered remotely or...

, in 1954, which showed the remains of a motte and bailey castle with a double ditch around the motte and a single ditch around the bailey.

Some excavation of the site was done in 1962 and 1968. The excavations found evidence of timber structures, as well as pottery.

Currently, only cropmarks and slight earthworks

Earthworks (archaeology)

In archaeology, earthwork is a general term to describe artificial changes in land level. Earthworks are often known colloquially as 'lumps and bumps'. Earthworks can themselves be archaeological features or they can show features beneath the surface...

 remain. This site is a Scheduled Monument.